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Groleau R, Chapman RSL, Lowe JP, Lyall CL, Kociok-Köhn G, James TD, Bull SD. BINOL as a Chiral Solvating Agent for Sulfiniminoboronic Acids. Anal Chem 2023; 95:16801-16809. [PMID: 37931004 PMCID: PMC10666087 DOI: 10.1021/acs.analchem.3c01613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 09/25/2023] [Indexed: 11/08/2023]
Abstract
1H NMR spectroscopic studies using BINOL as a chiral solvating agent (CSA) for a scalemic sulfiniminoboronic acid (SIBA) have revealed concentration- and enantiopurity-dependent variations in the chemical shifts of diagnostic imine protons used to determine enantiopurity levels. 11B/15N NMR spectroscopic studies and X-ray structural investigations revealed that unlike other iminoboronate species, BINOL-SIBA assemblies do not contain N-B coordination bonds, with 1H NMR NOESY experiments indicating that intermolecular H-bonding networks between BINOL and the SIBA analyte are responsible for these variations. These effects can lead to diastereomeric signal overlap at certain er values that could potentially lead to enantiopurity/configuration misassignments. Consequently, it is recommended that hydrogen-bonding-CSA-based 1H NMR protocols should be repeated using both CSA enantiomers to ensure that any concentration- and/or er-dependent variations in diagnostic chemical shifts are accounted for when determining the enantiopurity of a scalemic analyte.
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Affiliation(s)
- Robin
R. Groleau
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
| | | | - John P. Lowe
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
| | - Catherine L. Lyall
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
| | | | - Tony D. James
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
- School
of Chemistry and Chemical Engineering, Henan
Normal University, Xianxiang 453007, China
| | - Steven D. Bull
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
- School
of Chemistry, University of Leicester, Leicester LE1 7RH, U.K.
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Xu L, Wang Q, Liu Y, Fu S, Zhao Y, Huang S, Huang B. 19F NMR enantiodiscrimination and diastereomeric purity determination of amino acids, dipeptides, and amines. Analyst 2023; 148:4548-4556. [PMID: 37594386 DOI: 10.1039/d3an00761h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
Chiral amino-group compounds are of significance for human health, such as biogenic amino acids (AAs), dipeptides, and even various drugs. Enantiospecific discrimination of these chiral compounds is vital in diagnosing diseases, identifying pathological biomarkers and enhancing pharmaceutical chemistry research. Here, we report a simple and rapid 19F NMR-based strategy to differentiate chiral AAs, dipeptides, and amines, that were derivatized with (R)-2-(2-fluorophenyl)-2-hydroxyacetic acid ((R)-2FHA). As a result, 19 proteinogenic AAs (37 isomers) as well as Gly could be concurrently resolved. Moreover, various mirror-image dipeptides, such as Ser-His, Leu-Leu, and Ala-Ala, were commendably recognized. Intriguingly, we found that the absolute configuration of AAs in the N-terminus of dipeptides decided the relative 19F chemical shifts between two enantiomers. Besides, the ability of this method for enantiodiscrimination was further demonstrated by non-AA amines, including aromatic and aliphatic amines, and even amines having chiral centers several carbons away from the amino-group. The structurally similar antibiotics, amoxicillin and ampicillin, were well discriminated. Furthermore, this method accurately determines the de or dr values of non-racemic mixtures. Therefore, our strategy provides an effective approach for 19F NMR-based enantiodiscrimination and diastereomeric purity determination of amino-group compounds.
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Affiliation(s)
- Lihua Xu
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, 315211, P.R. China.
| | - Qiong Wang
- College of Chemistry, Shandong Normal University, Jinan, 250014, P.R. China
| | - Yan Liu
- Department of Chemical Biology, College of Chemistry and Chemical Engineering, and the Key Laboratory for Chemical Biology of Fujian Province, Xiamen University, Xiamen, 361005, P.R. China
| | - Songsen Fu
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, 315211, P.R. China.
| | - Yufen Zhao
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, 315211, P.R. China.
- Department of Chemical Biology, College of Chemistry and Chemical Engineering, and the Key Laboratory for Chemical Biology of Fujian Province, Xiamen University, Xiamen, 361005, P.R. China
- Key Lab of Bioorganic Phosphorus Chemistry & Chemical Biology, Department of Chemistry, Tsinghua University, Beijing, 100084, P.R. China
| | - Shaohua Huang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, 315211, P.R. China.
| | - Biling Huang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, 315211, P.R. China.
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Luo YX, Li GW, Mo ZH. Cyclodextrin-induced phase transformation of cesium copper bromide perovskite. Chem Commun (Camb) 2023; 59:10255-10258. [PMID: 37534603 DOI: 10.1039/d3cc02348f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
Phase transformation represents a fascinating way to tune the structural and optical properties of metal halide perovskites. Macrocyclic cyclodextrin could trigger transformation of cesium copper bromide, driven by strong interactions of the macrocyclic hydroxyl groups with the perovskite cesium and bromide ions.
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Affiliation(s)
- Yi-Xin Luo
- College of Chemistry and Chemical Engineering, Chongqing University, Shapingba, Chongqing 401331, China.
| | - Guo-Wu Li
- College of Chemistry and Chemical Engineering, Chongqing University, Shapingba, Chongqing 401331, China.
| | - Zhi-Hong Mo
- College of Chemistry and Chemical Engineering, Chongqing University, Shapingba, Chongqing 401331, China.
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Marta TB, Argondizzo AC, da Silva Oliboni R, Silva MS. NMR chiral recognition of lipoic acid by cinchonidine CSA: A stereocenter beyond the organic function. Chirality 2023; 35:40-48. [PMID: 36336792 DOI: 10.1002/chir.23514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 10/20/2022] [Accepted: 10/21/2022] [Indexed: 11/09/2022]
Abstract
Alpha-lipoic acid is a natural product that possesses distinct pharmacological properties. Lipoic acid is a short-chain fatty acid containing an asymmetric carbon at five bonds of distance to the organic function. Herein, we developed a nuclear magnetic resonance protocol to access the chiral recognition of lipoic acid in a simple and rapid procedure employing cinchonidine as a cheap chiral solvation agent in deuterated chloroform. To optimize this method, a statistical design of the experimental model was performed to produce a clear understanding of the optimal concentration, temperature, and molar ratio parameters. Based on the obtained spectra, the cinchonidine H8 -H9 scalar coupling indicated a conformational preference in the chiral discrimination procedure. Density functional theory calculations established a proximity between the asymmetric center of lipoic acid and the aromatic moiety of cinchonidine, clarifying possible conformations in this ion-pair interaction. The described protocol demonstrates how far is far enough to chiral discrimination using a chiral solvation agent, expanding the method to compounds that contain a remote stereocenter.
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Affiliation(s)
- Talia Behnen Marta
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, Pelotas, Rio Grande do Sul, Brazil
| | - Augusto Cardozo Argondizzo
- Grupo de Catálise e Estudos Teóricos, Universidade Federal de Pelotas - UFPel, Pelotas, Rio Grande do Sul, Brazil
| | - Robson da Silva Oliboni
- Grupo de Catálise e Estudos Teóricos, Universidade Federal de Pelotas - UFPel, Pelotas, Rio Grande do Sul, Brazil
| | - Márcio Santos Silva
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, Pelotas, Rio Grande do Sul, Brazil
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